3and 1

3and 1

Input
3 + 1
Result
4
Number name
four
Manipulatives illustration
| + | | = |
3 | | 1 | | 4
Percent increase
3 + 1 = 4 is 33.33% larger than 3.
Typical human computation times
age 6: 3.7 seconds | age 8: 2 seconds | age 10: 1.2 seconds |
age 18: 0.84 seconds
(ignoring concentration, repetition, variations in education, etc.)

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